Fuse-plug.



T. F. C615'.

FUSE PLUG.

APPLICATION FILED OCT- 13, 1914.

1,198,193. Patentedsept. 12,1916.

Si nue 14 fof.

THOMAS E. CT, 0F PRINCE ALBERT, SASKATCHEWAN, CANADA.

FUSE-PLUG.

Specification of Letters Patent.

Patented Sept. 12, 19:16.

Application filed October 13, 1914. Serial No. 866,491.

To all lwhom t may concern: l

Be it known that I, THOMAS F. CT, a subject of the King of Great Britain, residing at Prince Albert, in the Province of Saskatchewan and Dominion of Canada, have invented certain new and useful Improvements in l `usePlugsg and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates -to improvements in electric fuse plugs and has for its primary object to improve and simplify construction of such devices, increase the efficiency and reduce the cost of manufacture.

Another object of importance is to provide a fuse plug in which the parts are so assembled as to be readily disassembled to provide for the renewal of parts which may have become broken or deranged and which is provided with means whereby the fuse wire may be readily inspected without necessitating removal of certain parts of the device.

Another object is to provide novel means for supporting and operatively connecting the fuse wire with the contacting points of the plug.

The above and additional objects are accomplished by such means as are illustrated in the accompanying drawings, described in the following specification and then more particularly pointed out as claimed.

lVith reference to the drawings, wherein I have illustrated the preferred embodiment of my invention as it is reduced to practice and throughout the several views of which similar reference numerals designate corresponding parts, Figure 1 is a side elevation partly in section of the improved plug, and

Fig. 2 is a detail fragmentary vertical sectional view taken on the plane of line 2*2 of Fig. 1.

Referring t0 the drawings by characters of reference, 1 designates al frusto-conical base that is provided centrally with a threaded bore in which is mounted a metallic and threaded sleeve 2. The sleeve 2 is provided at its inner end with an annular flange 2a which flange is arranged to engage upon the inner face of the base 1 and prevents accidental removal of the sleeve. A flange 2" is provided at the outer end of the sleeve 2 to prevent inward movement of the sleeve. Turned within the sleeve 2 is a threaded metallic plug 3 that is provided with a beveled enlarged head 4 that is grooved and is formed similarly to a screw head. This plug 3 is so positioned that the head 4 projects from the outer face of the base and serves to form a contact with the socket, not shown, in which the plug is to be attached. A threaded opening 5 is formed in the inner end of the plug 3 and receives a fastening screw 6.

,Suitably secured to the inner part of the base 1 is a tapered hollow body 7 that is formed of some suitable insulating material such as porcelain and the like. The outer' face of this body 7 is threaded and has mounted thereon a metallic and threaded sleeve 8 which is tapered and snugly fits the body 7 The sleeve 8 is spaced at its outer end from the outer end of the body and said body is provided at a point adjacent to the `outer end of the sleeve with an annular bead 9. Formed on the body 7 at a point next adjacent to the lbead 9 is a laterally projecting annular' flange 10. The outer end of the body 7 is openand is designed to bc closed by a circular glass plate 11 which overlaps the edges of the open end and is secured in position by an annular flange securing ring 12. The ring 12 is provided at its inner and outer edges with annular depending flanges 13 and 14 which space the ring from the body, and engage the plate 11 for holding thesame in position.

The flanges 13 engage the outer face of the plate 11 at a point adjacent to its pcriphery and securely hold the same in position. The fiange 14 is slightly curved at the point of its formation with the ring and engages upon the outer face of the flange 10 at a point adjacent to its periphery. The flange 9 is provided with an upstanding annular enlargement or projection 15 and said enlargement or projection 15 is engaged upon its outer face by the flanges 14. Split pins 16 are inserted through the ring 12, projection 15 and fiange 9 and have their inner terminals bent angularly as at 17 so as to prevent withdrawal of the pins accidentally. These pins securely hold the ring 12 in posltion.

The vertical portion of an L-shaped contact member 18 is soldered or otherwise suitably connected as at 19 with the metallic casing or sleeve 8 and has its horizontal portion extended through an opening in the ody 7 and into the interior thereof. A screw 20 is turned in the free end ofthe horizontal portion of the L-shaped contact member. Y

Mounted within the body 7 is a fuse wire 21 of the usual type and which has its ends secured by the screws 6 and 20. By means of the screws 6 and 20 carried respectively by the plug 3 and contact member 18, the fuse 21 may be supported in the desired positionand in spaced relation to the wallsof the body. The contact is made through the medium of the metallic sleeve 8 and contact member 18 which is preferably `formed of copper and through the plug 3.

It will be readily seen that I have provided a simply constructed fuse plug that may be readily assembled and disassembled for the purpose of renewing the fuse wire or other parts which may have become broken or deranged. The glass plate 11 permits inspection of the wire to ascertain as to its condition and it is only necessary to remove the pin 16 and ring 12, and then the plate 1l to gain access to the wire 21.

In practice, I have found that the form of my invention, illustrated in the drawings and referred to in the above description, as the preferred embodiment, is the most efficient and practical; yet realizing that the conditions concurrent with the adoption of my device will necessarily vary, I desire to tion and arrangement of emphasize the fact that various minor changes in details of construction, proporsorted to when required, without sacrificing any of the advantages of my invention, as set forth.

What is claimed is In a fuse plug having one end of its body provided with a laterally projecting annular flange, said flange provided on its upper face with an upstanding annular enlargement forminv annular grooves on opposite sides of the ange, a glass closure plate seated in the inner groove of the enlargement closing the opening of the body, an annular ring having depending inner and outer flanges, the inner flanges of ring engaging the upper face of the glam plate, the outer flange of the ring engaging in the outer groove ofthe annular enlargement, and a plurality removable fastening elements extending through the ring and the enlargement andthe flange of the body holding the ring and plate in position.

In testimon whereof I-aix my signature in presence o two witnesses.

THOMAS F, COT. lVitnesses:

I. E. PARKER, J. S. NINoN.

parts may be re- 

